spi: spi-qpic-snand: make qcom_spi_ecc_engine_ops_pipelined const

spi: spi-qpic-snand: make qcom_spi_ecc_engine_ops_pipelined const

Marking the qcom_spi_ecc_engine_ops_pipelined as const provides
memory protection by preventing accidental modification of critical
function pointers at runtime. It also enables memory optimization
by placing the structure in read-only sections and improves code safety
by explicitly documenting the design intent that these operations
should not change after initialization.

Signed-off-by: Can Peng <pengcan@kylinos.cn>
Link: https://patch.msgid.link/20251023024250.3181084-1-pengcan@kylinos.cn
Signed-off-by: Mark Brown <broonie@kernel.org>